Diagnosis And Testing - Fuel Heater: Testing

WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Locating Water In Fuel (WIF) & Fuel Filter Housing

Courtesy of CHRYSLER LLC

NOTE:

The Fuel Heater is not a separately serviceable item. If diagnostics have led you to replace this sensor, then the whole fuel filter housing assembly (3) needs to be changed.

Disconnect harness connector (1) from heater element.
Ambient temperature must be below the circuit close temperature. If necessary, induce this ambient temperature by placing ice packs on thermostat to produce an effective ambient temperature below circuit close temperature.

Measure resistance across two pins. Operating range is 0.3 - 0.45 Ohms.
If resistance is out of range, replace the fuel filter housing.